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Mesophase negative electrode material and preparation method thereof

A technology of negative electrode material and intermediate phase, which is applied to the field of intermediate phase negative electrode material and its preparation, can solve the problems such as unobtainable yield of raw materials, high production cost, complicated process, etc., and achieves simple and feasible preparation method, stable product properties and retention rate. high effect

Active Publication Date: 2014-11-12
福建杉杉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of high production cost caused by the complicated process of the existing method for preparing negative electrode materials, unavailable raw materials and low yield, and provide a mesophase negative electrode material and its preparation method

Method used

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  • Mesophase negative electrode material and preparation method thereof
  • Mesophase negative electrode material and preparation method thereof
  • Mesophase negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0034] (1) Add 60 kg of spherical natural graphite (D50 is 19.1 μm), 140 kg of mesophase carbon microspheres (D50 is 25.4 μm) and graphitization catalyst (SiO 2 ) 16kg to get the mixture evenly mixed;

[0035] (2) Mix the mixture with 60kg of petroleum pitch powder (which has been crushed to below 0.1mm) in a kneading pot, and knead at 160°C for 1 hour;

[0036] (3) After the kneading is completed, press it into a sheet (thickness 4mm) in a tablet press, crush it into particles with an average particle size of less than 100 μm, and mold it into a briquette;

[0037] (4) Under the protection of nitrogen, carbonize at a temperature of 1100 ° C for 2 hours, and then cool the reaction product to room temperature;

[0038] (5) Catalytic graphitization high temperature treatment was carried out at 2800°C for 36 hours to obtain a mesophase anode material with a particle size D50 of 17.8 μm, a half-cell capacity of 352.5mAh / g, and an initial efficiency of 94.8%.

Embodiment 2

[0040] (1) Under stirring, alternately add 80kg of spherical natural graphite (D50 is 19.5μm), 120kg of mesophase carbon microspheres (D50 is 25.4μm) and 6kg of graphitization catalyst (SiC) and mix uniformly to obtain a mixture;

[0041] (2) Mix the mixture with 20kg of petroleum pitch powder (which has been crushed to below 0.1mm) in a kneading pot, and knead at 160°C for 1 hour;

[0042] (3) After the kneading is completed, press it into a tablet shape (thickness: 3 mm), crush it into particles with an average particle size of less than 100 μm, and mold it into a briquette;

[0043](4) Under the protection of nitrogen, carbonize at a temperature of 800°C for 6 hours, and then cool the reaction product to room temperature;

[0044] (5) Catalytic graphitization high-temperature treatment was carried out at 3000°C for 48 hours to obtain a mesophase anode material with a particle size D50 of 18.3 μm, a half-cell capacity of 353.1mAh / g, and an initial efficiency of 94.2%.

Embodiment 3

[0046] (1) Add 100 kg of spherical natural graphite (D50 is 20.1 μm), 100 kg of mesocarbon microspheres (D50 is 20.5 μm) and graphitization catalyst (SiO 2 ) 10kg mixed uniformly to obtain a mixture;

[0047] (2) Mix the mixture with 40kg of coal tar pitch powder (which has been crushed to less than 0.1mm) in a kneading pot, and knead at 160°C for 1 hour;

[0048] (3) After the kneading is completed, press it into a tablet shape (thickness: 5 mm), crush it into particles with an average particle size of less than 100 μm, and mold it into a briquette;

[0049] (4) Under the protection of nitrogen, carbonize at a temperature of 1500 ° C for 3 hours, and then cool the reaction product to room temperature;

[0050] (5) Catalytic graphitization high temperature treatment was carried out at 3200°C for 48 hours to obtain a mesophase anode material with a particle size D50 of 17.4 μm, a half-cell capacity of 355.0mAh / g, and an initial efficiency of 94.6%.

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Abstract

The invention discloses a mesophase negative electrode material and a preparation method thereof. The method comprises the following steps: 1, uniformly mixing spherical natural graphite with raw mesophase carbon microspheres and a graphitization catalyst to obtain a mixture; 2, carrying out heating kneading on the mixture and a graphitization adhesive for 1-2h to obtain a kneaded material; 3, pressing to form a block in order to obtain a formed body of the kneaded material; 4, charring the formed body at 800-1500DEG C under the protection of an inert gas, and cooling to room temperature; and 5, carrying out catalytic graphitization high temperature treatment at 2800-3200DEG C. The preparation method can further improve the charge and discharge capacity and the charge and discharge efficiency of the mesophase negative electrode material and improve the cycle performance of the material.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to an intermediate phase negative electrode material and a preparation method thereof. Background technique [0002] The mesophase carbon graphitization product is an excellent anode material for lithium-ion batteries. In recent years, lithium-ion batteries have been widely used in mobile phones, notebook computers, digital video cameras and portable appliances. Lithium-ion batteries have excellent performances such as high energy density, high working voltage, small size, light weight, no pollution, fast charging and discharging, and long cycle life. They are ideal energy sources for development in the 21st century. Mesophase carbon, as the negative electrode material of lithium-ion secondary batteries, has the characteristics of low potential, good flatness, high specificity, high initial charge and discharge efficiency, and good processability. Theoretically LiC 6 The reve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 谢秋生杜辉玉张鹏昌薄维通陈志明
Owner 福建杉杉科技有限公司
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